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首页> 外文期刊>Physical chemistry chemical physics: PCCP >Tuning morphology and photovoltaic properties of diketopyrrolopyrrole-based small-molecule solar cells by taloring end-capped aromatic groups
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Tuning morphology and photovoltaic properties of diketopyrrolopyrrole-based small-molecule solar cells by taloring end-capped aromatic groups

机译：通过封端的芳香族基团来调节基于二酮吡咯并吡咯的小分子太阳能电池的形貌和光电性能

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摘要

In this article, we selected BDT-DPP-BDT (DPP = diketopyrrolopyrrole and BDT = 4,8-di-2-(2-ethylhexyl)-thienyl-benzo[l,2-b:4,5-b']dithiophene) as the model backbone and end-capped rtwith hydrogen, octyl 2-cyano-3-(thiophen-2-yl)acrylate (CNR), and 2-hexylbithiophene (HTT), respectively, forming three small molecule donors: BDB, CNRBDB and HTTBDB. Introduction of a polar and planar electron-withdrawing unit of CNR to both ends of the BDB backbone enhances the hole mobility from 4.14 × 10~(-4) to 7.75 × 10~(-3) cm~2 V~(-1) s~(-1) and raises the fill factor from 27 to 57% when blended with PC_(71)BM. This is associated with the PC71BM phase size decreasing from 70 to 20 nm. When the electron-donating unit of HTT with poorer planarity is linked to both ends of the BDB backbone, both donor and acceptor phase sizes are decreased to 20 nm. The short-circuit current density is greatly improved from 4,22 to 9.66 mA cm~(-2), and the fill factor is enhanced to 46%. Overall, this work demonstrates that the end-capped aromatic groups play an important role in tuning the phase size and photovoltaic properties of DPP-based small molecule solar cells.
机译：在本文中，我们选择了BDT-DPP-BDT（DPP =二酮吡咯并吡咯，BDT = 4,8-二-2-（2-乙基己基）-噻吩基-苯并[1,2-b：4,5-b']二噻吩）作为模型的主链，并用氢，2-氰基-3-（噻吩-2-基）丙烯酸辛酯（CNR）和2-己基联噻吩（HTT）分别封端，形成三个小分子供体：BDB，CNRBDB和HTTBDB。在BDB骨架的两端引入CNR的极性和平面吸电子单元可以将空穴迁移率从4.14×10〜（-4）提高到7.75×10〜（-3）cm〜2 V〜（-1） s〜（-1），并与PC_（71）BM混合时将填充因子从27％提高到57％。这与PC71BM相尺寸从70 nm减小到20 nm有关。当具有较差平面度的HTT的电子给体单元连接到BDB骨架的两端时，施主和受主的相尺寸都减小到20 nm。短路电流密度从4.22 mA cm〜（-2）大大提高，填充率提高到46％。总的来说，这项工作表明，封端的芳族基团在调节基于DPP的小分子太阳能电池的相尺寸和光伏性质中起着重要作用。

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